BestLine Racing

The Biggest Problem: DPF-Related Downtime and Costs Trucking companies consistently report that diesel particulate filter (DPF) issues are among their most frustrating and costly maintenance challenges. The main problems include: Frequent Regeneration Cycles: DPFs require periodic regeneration to burn off accumulated soot. Excessive regeneration increases fuel consumption, causes downtime, and can interrupt delivery schedules. Clogging and Ash Buildup: Over time, soot and incombustible ash from engine oil and fuel accumulate in the DPF, leading to clogs. This results in reduced engine performance, increased backpressure, and potential engine damage. High Cleaning and Replacement Costs: Off-vehicle DPF cleaning typically costs $200–$1,000 per filter, depending on severity and location. If a DPF is too clogged or damaged, replacement can cost several thousand dollars. Fuel Efficiency Loss: Increased back-pressure from a clogged DPF forces the engine to work harder, reducing fuel efficiency and increasing operational costs. Unplanned Downtime: DPF failures or forced regenerations can take trucks out of service unexpectedly, impacting fleet productivity and profitability. Table: DPF-Related Cost Impacts Issue Typical Cost Impact (per truck) Extra fuel from regens Up to 5% increase in fuel consumption DPF cleaning (per event) $200–$1,000 DPF replacement $2,000–$5,000 Downtime (lost revenue) Varies, but can be significant How a Diesel Fuel Additive Can Help A diesel fuel additive that reduces DPF regenerations, increases fuel mileage, and extends engine life directly addresses these pain points: 1. Reduced DPF Regeneration Frequency Additives that improve combustion and reduce soot formation can lower the frequency of DPF regenerations, minimizing fuel waste and downtime. Fewer regenerations mean less thermal stress on the DPF, reducing the risk of filter damage and extending its service life. 2. Improved Fuel Mileage By cleaning injectors and optimizing combustion, quality additives can improve fuel efficiency, offsetting the cost of the additive and reducing overall fuel spend. Enhanced fuel economy is especially valuable for fleets operating on thin margins. 3. Extended Engine and DPF Life Additives that reduce soot and ash formation help keep the DPF and engine cleaner, lowering maintenance costs and the risk of expensive repairs or replacements. Improved lubricity and deposit control also protect critical engine components, supporting longer engine life. Industry Perspective Fleet operators and maintenance experts confirm that DPF issues remain a top concern despite improvements in after-treatment technology. Solutions that can reduce regeneration cycles, improve fuel economy, and extend component life are highly valued by the industry. In summary:A diesel fuel additive from BestLine Racing with proven ability to reduce DPF regenerations, increase fuel mileage, and extend engine life would offer significant operational and financial benefits to trucking companies, helping them address one of their most persistent and costly maintenance challenges. Contact us for more information and how we can help reduce your costs. 

10 Largest Trucking Companies in the USA by Fleet Size (2025) The largest trucking companies in the United States by fleet size are determined by the number of tractors (power units) they operate. The following list is based on the most recent industry rankings for 2025, focusing on for-hire carriers: Rank Company Name Tractors (Power Units) Trailers 1 FedEx Corp. 38,384 148,585 2 United Parcel Service (UPS) 19,267 84,956 3 Knight-Swift Transportation 21,835 45,453 4 J.B. Hunt Transport Services 20,500 46,300 5 Schneider National 14,500 47,003 6 Penske Logistics 10,621 42,388 7 Ryder System 11,281 46,714 8 Werner Enterprises 9,700 34,400 9 R+L Carriers 9,023 23,825 10 Estes Express Lines 11,281 46,714 Notes: Tractor counts include company-owned, lease-to-own, and owner-operator units. Some companies, such as FedEx and UPS, operate both package and freight divisions, contributing to their large fleet sizes. Rankings are based on the most recent data available for 2025. Key Observations FedEx Corp. and UPS remain the largest by a significant margin, each operating tens of thousands of tractors and trailers. Knight-Swift, J.B. Hunt, and Schneider are the largest truckload carriers. R+L Carriers and Estes Express Lines are among the largest less-than-truckload (LTL) carriers by fleet size. These companies represent the backbone of freight movement in the U.S., serving a wide range of industries and regions.

Engine and Motor Types Used by the Largest U.S. Trucking Companies Below is a summary of the primary engine and motor types used by the 10 largest U.S. trucking companies by fleet size. Most large fleets operate a mix of diesel, gasoline, and increasingly, alternative fuel and electric powertrains. The specific engine models can vary by vehicle type and application. Company Name Main Engine/Motor Types Used Notable Details FedEx Corp. - Gasoline: GM 6.0L V8, Ford 7.3L V8- Diesel: Cummins ISB 6.7L, Cummins 5.9L ISB- Hybrid Electric- Isuzu 3.0L Diesel Operates a diverse fleet including step vans and tractors; uses hybrid and lightweight vehicles. UPS - Diesel: Cummins 4BT, 6BT, Navistar 444E (7.3L PowerStroke), VT365 (6.0L PowerStroke), International Diesel- Gasoline: Chevy 4.3L, 6.0L V8- Natural Gas: Cummins X15N 15L- Hybrid Electric Large focus on alternative fuels; recently added natural gas-powered Kenworth T680s. Knight-Swift Transportation - Diesel: Detroit DD13, DD15- Natural Gas: Cummins X15N 15L (RNG)- Testing hydrogen ICE Testing renewable natural gas and hydrogen engines for sustainability. J.B. Hunt Transport Services - Diesel: Detroit DD13, DD15- Natural Gas: Cummins X15N 15L (RNG)- Electric: Freightliner eCascadia (pilot) Early adopter of RNG and electric trucks; testing Cummins X15N. Schneider National - Diesel: Detroit DD15 Gen5 (Freightliner Cascadia)- Some Cummins engines Standardizes on Detroit engines for new trucks. Penske Logistics - Diesel: Detroit, Cummins, others (varies by customer spec)- Electric and hybrid options Offers a range of engines based on customer needs; supports DEF and SCR technology. Ryder System - Diesel: Cummins, Detroit, Volvo, Mack- Natural Gas: Cummins ISL-G- Electric and hybrid options Operates a mixed fleet, including natural gas and electric vehicles. Werner Enterprises - Diesel: Detroit DD15, Cummins X15- Natural Gas: Cummins X15N 15L- Hydrogen: Cummins 15L Hydrogen ICE, Hydrogen Fuel Cell (pilot) Integrating natural gas and hydrogen engines for sustainability. R+L Carriers - Diesel: Peterbilt tractors (typically Cummins or PACCAR engines) Operates a large fleet of Peterbilt tractors; specific engine models may vary. Estes Express Lines - Diesel: Primarily Freightliner and International tractors (Detroit, Cummins engines) Uses standard industry diesel engines; details vary by tractor model. Key Trends Diesel engines (Detroit, Cummins, International) remain the backbone for long-haul and heavy-duty applications. Natural gas engines (notably Cummins X15N) are being rapidly adopted for sustainability, especially by UPS, Knight-Swift, J.B. Hunt, and Werner. Hybrid and electric vehicles are in pilot or early adoption phases, especially for local delivery and regional haul. Engine selection often depends on the specific application, region, and sustainability goals of each company. This table reflects the most common and notable engine types in use as of 2025, but each fleet may include additional models and alternative powertrains for specialized needs.